Improvement of slow light properties by structure tuning in optofluidic infiltrated photonic crystal waveguides

Wide band and low dispersion slow light in optofluidic infiltrated photonic crystal waveguide has been theoretically demonstrated. By adjusting the refractive indices of infiltrated optofluidic in the nearest four rows of air holes beside the defect waveguide and tuning the radius of bulk holes, the group index and bandwidth can be enlarged effectively at the same time. Considering the restricted variation of group index within ±10%, the flat band slow light at any group index from 17.80 to 77.55 with large normalized delay bandwidth product staying in the range of 0.32 to 0.36 has been obtained.